JPH1076991A - Buoyancy material and floatable personal belongings using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a buoyancy material and floatable personal belongings using it light and soft, waterproofing, protective against the cold and favourable in a heat retaining property and make it work the same action as a lift jacket by forming a synthetic resin foaming sheet having fine closed cells in specific thickness and apparent density. SOLUTION: Thickness of a synthetic resin foaming sheet having fine closed cells is made 0.05-5mm, and apparent density is made 0.002-0.2g/cm<3> . This foaming sheet is mainly made of polyethylene and polypropylene, and a simple substance or a blended substance of high density, intermediate density or low density polyethylene and polypropylene and their denaturated copolymer, etc., are favourable. A foaming agent is to be hydrocarbon halide of liquid propane gas, freon 12, etc., and azodicarbon amid, sodium citrate, sodium bicarbonate, etc. Additionally, for example, in case of a long jacket, a front body 1 and a back body 2 are quilting sewn, and a sleeve 3 and a pocket 4 are stitched and stopped. Specifications and a design of a quilting 5 are optionally selected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buoyancy material and a buoyant recyclable product using the same, and has been developed for the purpose of minimizing drowning accidents caused by seas, rivers, lakes, marshes and wind and flood damage. is there.

[0002]

2. Description of the Related Art Life jackets are widely used to prevent drowning due to water. The life jacket is called a floating jacket worn to float the human body, its performance is stipulated in JIS F 1026, its structure is thickened and swelled by air or gas injection, and it can be used as everyday clothes and personal items Not something like that. There is also a fixed type polyethylene foam as the core, but in general, the thickness is 5 mm or more and several tens of mm and one or two sheets are stacked and used to provide buoyancy. In addition, floating jackets generally cover the buoyancy material completely with a waterproof cloth or sheet so that water does not enter the space. Therefore, they cannot be used as everyday clothes.

[0003]

However, in modern times, from our living environment, commuting, going to school and working sites,
Or, unexpected floods and drowning accidents that occur in daily life such as leisure and sports are occurring frequently. It is practically impossible to always wear a conventional life jacket in preparation for such an unexpected accident, and it is also fashionable to always carry a buoyant bag or the like to carry personal belongings. Also lacking, is not realistic.

[0004] The present invention has a light and soft feel and excellent waterproofness, cold protection, and heat retention, similar to everyday clothes.
In the event of an emergency, a study was conducted on a buoyancy material suitable for body goods such as clothing, which has the same effect as a life jacket, and a buoyant body goods using the same.

[0005]

That is, the buoyancy material is a synthetic resin foam sheet having fine closed cells, and the sheet has a thickness of 0.05 to 5 mm, preferably 0.1 to 5 mm.
It is in the range of 2 mm and has an apparent density of 0.002 to 0.2 g / cm ³ , preferably 0.01 to 0.1 g / cm ³ .

Here, the synthetic resin foam sheet having fine closed cells can be made of polyolefin, polyurethane, polystyrene, etc., of which polyethylene and polypropylene are mainly used, and high-, medium-, or low-density polyethylene or polypropylene alone or as a blend. Products, and further, these modified copolymers are preferred. Further, in order to increase flexibility, a graft copolymer such as EPDM or styrene / butadiene oligomer having an unsaturated double bond can be effectively used.

[0007] In order to provide good buoyancy to the sheet, it is necessary to form a fine closed-cell foam. As a blowing agent therefor, liquid propane gas (LP) as a low-boiling hydrocarbon is used.
G), halogenated hydrocarbons such as Freon 12, etc., as well as azodicarbonamide, sodium citrate, sodium bicarbonate, etc. as chemical blowing agents are effective, and the thickness is 0.05 to 5
mm is preferably about 0.1 to 2 mm, and the apparent density is 0.002 to
0.2 g / cm ^3, preferably 0.01 to 0.1 g / cm ^3. If the value is out of these ranges, the buoyancy may be insufficient, or the flexibility and strength may be inappropriate.

The use of such a buoyancy material to produce a buoyant body goods mainly includes clothes, especially work clothes, student clothes, jackets, jumpers, vests, underwear, panties, socks, gloves, and so on. It can be used for a wide range of personal items such as winter caps and leisure wear such as skis, water skis, ice skates, swimwear, and jackets. Also, bags,
It can be applied to personal belongings such as school bags and rucksacks.

In the case of clothes, it is preferable that one or a plurality of the above-mentioned buoyancy materials be stacked on the center of the clothes and quilted and sewn together with the outer cover material. A method of inserting a buoyancy material put in a mesh inner bag between the outer material and the lining of the garment is also applicable. The bag is also a buoyant recyclable product formed by laminating one or a plurality of the above-mentioned buoyancy materials on the center of a base material such as a luggage bag and sewing or heat-sealing them together with the skin. Approximate amount of buoyancy material used is about 11 for 50 kg body weight
0-130 g.

In this case, it is particularly important that these buoyancy materials are not completely covered with the covering material so that they do not come into contact with water. Therefore, in the event of an emergency, it is necessary that the buoyancy material of the core immediately comes into contact with water in the event of emergency, such as by using a water-permeable mesh fabric for all or part of the jacket material. .

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail. The production of the polyolefin foam sheet as a synthetic resin foam having fine closed cells of the present invention can be produced according to the flowchart of FIG. That is, medium-density polyethylene is used as the polyolefin, Freon 12 is used as a foaming agent, and polyoxyethylene nonylphenyl ether is used as a surfactant (release agent). Extruded through a flat nozzle, extruded from a flat nozzle, formed into a closed-cell foamed sheet having a thickness of 0.5 mm through calender rolls, passed through an aging cooling roll, and having a thickness of 0.5 ± 0.03 mm and an apparent density of 0.0251 to 0.0285. A buoyancy material consisting of a g / cm ³ polyethylene foam sheet was used.

The following test items were measured for the performance of the buoyant material according to the test method of JIS F 1026 “Floating jacket for boats”. The equipment used is a low-temperature bath (PSL), a buoyancy measuring device, and a salt spray tester (ST-J). 1. Buoyancy test After the iron piece is suspended in fresh water, the weight is gradually increased, and the weight of the iron piece (initial buoyancy) is measured when the product reaches the fully submerged state. After standing for 24 hours with the 74N iron piece suspended, the buoyancy is measured again to calculate the rate of change in buoyancy. 2. Oil resistance test (Material test) Take ^three or more test pieces of 125 cm ³ or more and use light oil (JIS K 220
4) After measuring the initial buoyancy in the sample, leave it for 24 hours, measure the buoyancy in light oil again, and calculate the rate of change in buoyancy. 3. Salt Spray Test (Material Test) Take ^three or more test pieces of 125 cm ³ or more, measure the initial buoyancy in fresh water, conduct a salt spray test according to the method of JISZ 2371 for 24 hours, and wash again in fresh water. The buoyancy is measured and the rate of change of the buoyancy is calculated. 4. Cold resistance test (material test) Take ³ or more test pieces of 125cm3 or more, measure the initial buoyancy in fresh water, leave in a constant temperature bath at -30 ± 5 ° C for 1 hour, take out and re-buoyant Is measured, and the change rate of the buoyancy is calculated. 5. Heat resistance test (Material test) Take ³ or more test pieces of 125cm3 or more, measure the initial buoyancy in fresh water, leave in a constant temperature bath at 60 ± 5 ° C for 1 hour, take out, and measure the buoyancy again. Measure and calculate the rate of change of buoyancy.

The test results are shown in Table 1 as Example 1. As Comparative Example 1, an average thickness of a general foamed polyethylene sheet which is a commercially available cushioning sheet for packaging is 5 mm, and an apparent density is 0.2 g.
/ cm ³ is also shown. As a result, the polyolefin sheet having the physical properties of the present invention exhibits good buoyancy, oil resistance,
It was excellent in water resistance, cold resistance and heat resistance, and the fluctuation of buoyancy was 5% or less.

[0014]

[Table 1]

As the polyolefin as a buoyancy material, a polymer obtained by grafting an EPDM oligomer onto polypropylene to impart flexibility to polypropylene was used, and a fine closed-cell foamed polyolefin foam sheet was produced in the same manner as in the above-mentioned polyethylene. The average thickness is 1.0 mm and the average apparent density is 0.
It was 03 g / cm ³ . The buoyancy and other physical properties of this product were evaluated according to the test method of JIS F 1026 described above.
Column. Even a commercially available flexible polyurethane foam has water repellency with closed cells, as long as it has the properties of the present invention, as with the polyolefin foam sheet,
Exhibits the performance as a buoyancy material.

The buoyancy and other physical properties of this were
It was evaluated by the test method of SF 1026 and is shown in the column of Example 3 in Table 1.

Next, using the buoyancy material sheet having fine closed cells of Example 1, a long jacket shown in FIG.
4 and the vest shown in FIG. 4 were sewn with a core material of between 4 and 21 sheets each. Table 2 shows the standard number of buoyancy materials according to the weight of the wearer.
It is as follows. In this case, in the long jacket, the front body 1 and the rear body 2 are quilted and the sleeves 3 and the pockets 4 are stitched. The specifications and design of the quilting 5 are arbitrarily selected. Short jackets and vests increase the number of layers of buoyancy material because the area of clothing is small.
Further, in the case of a short jacket, a buoyancy material mat wrapped with a detachable mesh backing cloth 7 is provided on the back to adjust buoyancy and heat retention. In the vest, in this case, the chuck 10 opens and closes, and the pocket flap 8 also has four cores. Further, a switching portion 9 is formed on the predecessor 1 in consideration of the design, and even the core is sewn to the center with a sewing machine. As shown in Table 2, the guideline of the number of layers for maintaining sufficient buoyancy with respect to the weight of the wearer is listed, but is not limited thereto.

[0018]

[Table 2]

What is important here is that the buoyancy material is not completely covered with a waterproof cloth so as not to wet the buoyancy material as in the conventional floating jacket. When landing, the buoyancy material must be in immediate contact with the water. for that reason,
Use a mesh cloth 7a for the hem of the jacket, or use a mesh cloth for the lining.

Further, as an example of a backpack, a cloth backpack for schoolchildren made of cloth as shown in FIG.
The buoyancy material 6 was put in the center of the belt 14, the shoulder pad 15, and the bottom cover 16 and sewn in the center of the body 11, the backrest 12 and the outer cover 13 as five cores. Outside pocket 17
In this case, only the outer cloth is used, but a buoyancy material may be put in the core. It is preferable to provide a fastener 18 in the upper half of the main body 11 so that the contents do not go outside. Also in this case, a part or the whole of the backrest 12 and the outer cover 13 is covered with the water-permeable material so that the internal buoyancy material comes into contact with water immediately upon landing.

[0021]

The buoyancy material according to the present invention has the above-described structure. When the buoyancy material is used as a core material of clothes, bags, and other personal belongings, the buoyancy material is similar to everyday clothes. It has a light and soft feel and has excellent waterproof, cold and warmth retention properties, and when it encounters an emergency such as a marine accident, it has the same effect as a life jacket, helping to rescue people and prevent loss of belongings.

[Brief description of the drawings]

FIG. 1 is a manufacturing flowchart of a buoyant foam sheet.

FIG. 2 is a partially cutaway front view of a long jacket.

FIG. 3 is a partially cutaway front view of the short jacket.

FIG. 4 is a partially cutaway front view of a vest.

FIG. 5 is a partially cutaway side view of a backpack for schoolchildren.

[Explanation of symbols]

 Reference Signs List 1 front body 2 back body 3 sleeve 4 pocket 5 quilting 6 buoyancy material (middle core) 7 backing cloth 7a mesh cloth 8 flap 9 switching section 10 chuck 11 main body 12 back rest 13 jacket 14 belt 15 shoulder rest 16 bottom cover 17 outer pocket

 ──────────────────────────────────────────────────続 き Continuing from the front page (71) Applicant 396015231 Soichiro Kusaka 1342-371 Nishizaka, Kurashiki City, Okayama Prefecture

Claims (4)

[Claims] 1. A synthetic resin foam sheet having fine closed cells, wherein the sheet has a thickness in the range of 0.05 to 5 mm and an apparent density of 0.002 to 0.2 g / cm ^3. Buoyancy material. 2. A buoyant clothing, wherein the clothing is clothing, and one or more of the buoyancy material according to claim 1 is sewn on the center of the clothing. 3. A buoyancy bag which is made by laminating one or more buoyancy materials according to claim 1 on the center of a base material of the bag. 4. The buoyant body according to claim 2, wherein the buoyancy member attached to the body part is partially or entirely permeable to water so as to be in direct contact with water.